Steve Carell: "Something I found in watching your performance specifically was that by the end of it, you know, you can hang on people’s words in movies... I was hanging on your face. Trying to figure out what was going on inside of you".

Rooney Mara: "A lot of people in my personal life feel that way".

Steve Carell: "It was fascinating. You know when they say, “If you want someone’s attention, whisper.” To try to break through the cacophony of all this information and everything happening, sometimes just take it really, really subtle. I felt like your performance was that way, because it was so nuanced that I was hanging on every moment".

Quand Darren Aronofsky (en tant que producteur) propose à Pablo Larrain de réaliser JACKIE, Larrain pose une condition : que Natalie Portman soit Jackie. "Sinon je ne fais pas le film". Pourquoi Portman ? Pablo Larrain explique : "It was her mystery. You sit her in front of the camera, dress her however you need to dress her, get her to look however she has to, ask her to describe everything she feels and everything she’s thinking, and you will still wonder what’s going on. That’s her mystery. That’s a resource in cinema. You never get all the answers. If you do, the game is over".